[Lowfer] 630 meter WSPR last night

[N1BUG]

Balloons often use WSPR but this would be the first time I have heard of 
one on 630m. That would be an interesting antenna  challenge. ;-)

I can offer a comment or two from personal experience.

Recent versions of WSJT-X write all call signs and grid squares decoded 
on WSPR to a file called HASHTABLE.TXT. Once a false decode happens the 
first time and gets into that file, it can be more likely for the same 
false decode to crop up over and over. I have seen this many times with 
my 'nemesis' false decode - a particular call/grid combination that used 
to happen quite often with my particular noise profile. If I deleted it 
from HASHTABLE.TXT it would typically be a few days before it came up 
again, but once it did (and was written back into the file) it would 
keep coming up several times every night until I deleted it again.

It wouldn't be unprecedented for the same false decode to occur at more 
than one station. From time to time, perhaps changing with new versions 
of the software, or alignment of planets or who knows what, there has 
appeared to be a slight predisposition to particular false decodes.

73,
Paul N1BUG